che-server Skip refresh GitHub tokens, override refresh Azure DevOps token request

Return existed token on GitHub token refresh request. GitHub Oauth tokens do not have expiration date, so no need to refresh them. Refresh token request will fail for such tokens because they do not have expires_in value, see: https://docs.github.com/en/apps/creating-github-apps/authenticating-with-a-github-app/refreshing-user-access-tokens#refreshing-a-user-access-token-with-a-refresh-token
Override the refreshToken function for Azure DevOps. The existed refresh function from the oauth2 package fails because Azure DevOps supports POST requests in application/x-www-form-urlencoded format only.

fixes https://github.com/eclipse-che/che/issues/23028

see https://github.com/eclipse-che/che/issues/23028 Same steps are relevant for Azure DevOps

Reviewers, please comment how you tested the PR when approving it.

Jul 10 '24 14:07 vinokurig

/retest

Jul 19 '24 11:07 vinokurig

/retest

Jul 22 '24 06:07 vinokurig

Verified on Eclipse Che with quay.io/eclipse/che-server:pr-699 - the functionality works properly.

Jul 24 '24 06:07 artaleks9

/retest

Jul 24 '24 11:07 vinokurig

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: artaleks9, ibuziuk, tolusha, vinokurig

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